Energy storage and temperature change type air conditioning method with underground reservoir and water source heat pump, and the dedicated device thereof

ABSTRACT

The present invention discloses a variable temperature air-conditioning method using underground reservoir and water-source heat pump with energy-storage and its specialized equipment, which includes a geothermal heat exchanging cycling loop and an air-conditioning heat exchanging cycling loop, wherein the air-conditioning heat exchanging cycling loop includes a variable temperature air-conditioning heat exchanging cycling loop. In the geothermal heat exchanging cycling loop, the water-source heat pump exchanges energy with energy-storage tanks, and in the air-conditioning heat exchanging cycling loop, the energy-storage tanks exchanges energy with an air-conditioning load loop.

BACKGROUND OF THE PRESENT INVENTION

1. Field of Invention

The present invention relates to a water-source heat pump, and moreparticularly to a variable temperature air-conditioning method usingunderground reservoir and water-source heat pump with energy-storage andits specialized equipment.

2. Description of Related Arts

Water-source heat pump is an effective energy-saving heating and coolingair-conditioning system for buildings by using low-ground heat includingunderground or surface water. The application of water-source heat pumptechnology has to be limited because of the following problems duringthe utilization of the underground and surface water. Well-drilling andunderground recharge is high cost. The surface water is substantiallysubject to the environment temperature. Heat exchange affects theecological environment.

A buried-tube type of water-source heat pump system is to bury tubes forexchanging heat from rock and soil to a thermal storage medium. Theshallow-buried tubes will be greatly influenced by the surfacetemperature and solar radiation, so that the system has low stability.The deep-buried vertical tubes adopt high pressure polyethylene plasticU-shaped tube, so that the costs on related materials and ground-holedrilling are high. Besides, the buried-tube type of water-source heatpump system demands high quality heat exchanger and geologicalstructure, has low energy level per unit in heat exchange, and hashigher system investment than other types of water-source heat pump, sothat it is generally applicable to residential buildings with small unitand low temperature control standard, and hardly applicable to largeair-conditioning engineering with high temperature control stability andstandard.

With the progress of the air-conditioning energy-saving technology, anair-conditioner with variable temperature that can output differenttemperature in different period is required due to the high requirementon temperature control stability and standard. The air-conditioner withvariable temperature requires stable output temperature and reliablesystem operation. When main heating pump is faulty, the system still canassure the temperature control, which is applicable to high end hotel,artificial weather room, plant factory, farm green house and so on thatrequire stable output temperature and reliable system operation, so thatsystem requires reserve heat pump, which causes the increased power andinvestment.

Because the water-source heat pump outputs variable power at intervals,the present technology only provides air-conditioning energy by directlyoutputting energy through secondary cycling thermal storage medium,which means that the water-source heat pump can not store energy duringthe operation, so that reliable and stable constant output can not berealized to meet the requirement of energy-saving operation mode. Inaddition, low capacity and quick temperature changing of the presentheat source result in large temperature variation and power consumption,so that the air-conditioning system with underground exchanger needs toincrease the capacity of the underground and reduce the complexity andthe occupation of the construction. And further more, a method to lowerthe water-source heat pump investment and improve the operatingreliability has to be found.

SUMMARY OF THE PRESENT INVENTION

A main object of the present invention is to provide a variabletemperature air-conditioning method using underground reservoir andwater-source heat pump with energy-storage, which can lower theinvestment and operating cost, increase the air-conditioning systemefficiency and reliability, and realize a constant and even temperatureoutput without intervals.

Accordingly, in order to accomplish the above object, the presentinvention provides a air-conditioning method using underground reservoirand water-source heat pump with energy-storage, comprises steps ofcollecting energy from a underground reservoir via a water-source heatpump, storing energy in energy-storage water tanks respectively, andexchanging energy between the energy-storage water tanks andair-conditioning load.

Each energy-storage water tank exchanges energy with an output of thewater-source heat pump and a variable temperature air-conditioning loadrespectively.

The step (b) and step (c) are simultaneous or respective.

The energy exchanging between the energy-storage water tanks andair-conditioning load are constant without interval.

The present invention also provides an air-conditioning system usingunderground reservoir and water-source heat pump with energy-storage,comprises a underground reservoir, a water-source heat pump communicatedwith said underground reservoir, an air-conditioning load communicatedwith said water-source heat pump, and a plurality of energy-storagewater tanks that are connected in parallel, wherein each energy-storagewater tank is communicated with output end of said water-source heatpump via an input gating switch valve, and communicated with saidvariable temperature air-conditioning load via an output gating switchvalve.

A heat absorbing unit and a heat radiating unit are provided in saidunderground reservoir, which are optionally connected with saidwater-source heat pump respectively.

The underground reservoir is formed by trenchless explosion, orcomprises buried pipes that are formed by trenchless horizontaldirectional drilling and pipe jacking.

The buried pipes is embodied as at least one selected from a groupconsisting of metal pipe, plastic pipe, glass-fiber pipe, or pre-madereinforced concrete pipe.

The buried pipes comprise an inner casing and an outer casing, wherein athermal insulation material is provided therebetween.

The underground reservoir comprises multi-layers in a longitudinaldirection, wherein every two adjacent pipe casings have a spacingranging from 3 m/9.8425 feet to 8 m/26.25 feet.

These and other objectives, features, and advantages of the presentinvention will become apparent from the following detailed description,the accompanying drawings, and the appended claims.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic view of working flow of a variable temperatureair-conditioning system utilizing underground reservoir and water-sourceheat pump with energy-storage according to a preferred embodiment of thepresent invention.

FIG. 2 is a schematic view of a system according to an embodiment of thepresent invention.

FIG. 3 is a schematic view of a system according to another embodimentof the present invention.

FIG. 4 is a schematic structural view of an underground reservoir thatis formed by trenchless explosion according to an embodiment of thepresent invention.

FIG. 5 is a schematic structural view of a underground reservoircomprises buried pipes that is installed by trenchless horizontaldirectional drilling and pipe jacking according to an embodiment of thepresent invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

Variable temperature air-conditioning system is an energy-savingtechnology that outputs variable temperature in different time segmentaccording to the requirement. For example, in daylight, more energy isneeded, while at night less energy is needed, or vise versa. In order tokeep even temperature, a heat pump with maximum output and reserve heatpumps are needed to keep the system reliability, which is typicallyapplied to agriculture buildings such as plant factory. The key toimprove the system energy-storage is to lower the operating powerconsumption, and improve the reliability and temperature stability. Byimproving the system energy-storage, the number of the configured heatpumps and power can be reduced.

Referring to FIGS. 1, 2 and 5 of the drawings, a variable temperatureair-conditioning method using underground reservoir and water-sourceheat pump with energy-storage and its system applied to agriculturebuildings or agriculture greenhouse are illustrated, in which the systemcomprises a underground reservoir 1, a water-source heat pump loop 2, acycling thermal storage medium 3, a geothermal heat exchanging watersupply cycling loop 4, an air-conditioning load loop 5, a working watertank 6, energy-storage water tanks B, a controller 8, and electric andmanual reversing switch valves. Wherein the underground reservoir 1includes a drilling and pipe jacking underground reservoir 102, a buriedconnecting pipe 111, an infiltration pipe 112, a maintenance hole 113, athermal insulation layer 114, wherein the cycling thermal storage medium3 includes a secondary cycling thermal storage medium 311 and a finalcycling thermal storage medium 312; the electric and manual switchvalves includes a heating cycling path switch valve K1, a coolingcycling path switch valve K2, energy-storage water tank input gatingswitch valves K3-1, K3-2, K3-3, energy-storage water tank output gatingswitch valves K3-4, K3-5, K3-6; the geothermal heat exchanging watersupply cycling loop 4 includes the underground reservoir 1, a watersupply pipe 401, a decontaminating device 411, a one-way valve 412, awater supply pump 413, a working water tank 6, electric and manualreversing switch valves. The water-source heat pump loop 2 includes atleast one paralleled heat pump 201, at least two cycling transmissionpumps and a plurality of switch valves, wherein a switchablewater-source heat pump loop that can output heat or cool energy isformed among at least two cycling transmission pump, and a plurality ofswitch valves and heat pump 201. The energy-storage water tanks compriseone or more energy-storage water tanks 7. The energy-storage water tankinput gating switch valves K3-1, K3-2, K3-3, energy-storage water tankoutput gating switch valves K3-4, K3-5, K3-6 and energy-storage watertanks are connected in parallel forming paralleled energy-storage watertanks B.

Air-conditioning load loop 5 includes a conventional air-conditioningload loop and a variable temperature air-conditioning load loop whereinthe load output temperature is controlled via variable temperatureair-conditioning method. The variable temperature air-conditioning loadloop further includes the variable temperature air-conditioning loadloop at intervals and without intervals. The variable temperatureair-conditioning load loop includes variable temperatureair-conditioning cycling pipe or heating and cooling cycling pipe 501,wherein heating and cooling cycling pipe includes heating cycling pipe511 and cooling cycling pipe 512 or other air-conditioning loads.

Referring to FIG. 1 of the drawings, geothermal heat exchanging cyclingloop A comprises a geothermal heat exchanging water supply cycling loop4 and a water-source heat pump loop 2. The underground reservoirsupplies water to working water tank 6 through the geothermal heatexchanging water supply cycling loop 4, to the water-source heat pumploop 2, and to the energy-storage water tanks 7 through the heatingcycling path switch valve K1 and the refrigerating cycling path switchvalve K2 controlled by the controller 8, and the energy-storage watertank input gating switch valves K3-1, K3-2, K3-3, so as to forming ageothermal heat exchanging cycling loop. Air-conditioning heatexchanging cycling loop C includes a variable temperatureair-conditioning load loop 5, electric and manual reversing switchvalves, and so on. The energy-storage water tanks output heat and coolenergy to variable temperature air-conditioning load loop through theheating cycling path switch valve K1 and the refrigerating cycling pathswitch valve K2 controlled by the controller 8, and the energy-storagewater tank output gating switch valves K3-4, K3-5, K3-6, so as toforming a air-conditioning heat exchanging cycling loop. The outputvariable temperature air-conditioning energy includes the variabletemperature air-conditioning energy which has intervals and which isconstant without intervals.

The working flow and the interrelationship among the respective cyclingloops of the variable temperature air-conditioning method usingunderground reservoir and water-source heat pump with energy-storage andits system are illustrated in FIG. 1. The cycling system includes ageothermal heat exchanging cycling loop A, a paralleled energy-storagewater tanks B, and an air-conditioning heat exchanging cycling loop C.Wherein the geothermal heat exchanging cycling loop A includes ageothermal heat exchanging water supply cycling loop 4 and awater-source heat pump loop 2. The geothermal heat exchanging cyclingloop A collects heat and cool energy from the underground reservoir andbuffers energy in the paralleled energy-storage water tanks B throughthe geothermal heat exchanging water supply cycling loop 4 and thewater-source heat pump loop 2. The air-conditioning heat exchangingcycling loop C includes a variable temperature air-conditioning loadloop 5. The air-conditioning heat exchanging cycling loop C collectsenergy from the paralleled energy-storage water tanks B, and outputs tothe variable temperature air-conditioning load loop 5. The geothermalheat exchanging cycling loop A and the air-conditioning heat exchangingcycling loop C can proceed at same time or respectively.

Under the control of the controller 8, the geothermal heat exchangingcycling loop A cycles energy among the energy-storage water tanks andthe geothermal heat exchanging water supply cycling loop 4 and thewater-source heat pump loop 2. Meanwhile, the air-conditioning heatexchanging cycling loop C cycles energy between the energy-storage watertanks and the variable temperature air-conditioning load. Water-sourceheat pump and load can connect and switch among the paralleledenergy-storage water tanks at the same time or respectively formingenergy collecting cycle and releasing cycle, so as to meet thetemperature requirement day and night without intervals. When theheating and cooling heat pump need to be maintained, the system won'tstop the output to the load due to the energy-storage water tanks. Thesystem preserves a certain mount of heat and cool energy for beingoutput during the maintenance and electrical supply peek periods, sothat the system has low operation cost, high energy-storage volume andhigh system reliability, and can keep constant and even temperature.Further more, the configured power of the heat pump can be reduced, thesystem investment is lower than the conventional technique, and thesystem efficiency is higher than the conventional technique.

In winter heating operation mode, the input end of the water-source heatpump loop connects to the working water tank 6, and the geothermal heatexchanging water supply cycling loop 4 cycles energy with thewater-source heat pump loop 2 through the working water tank 6. Theoutput end of the water-source heat pump loop 2 connects to theenergy-storage water tanks B comprising one or more energy-storage watertanks connected in parallel. Under the control of the controller 8, theenergy-storage water tanks can connect and switch to the water-sourceheat pump, which is to connect and switch the variable temperatureair-conditioning heat exchanging cycling loop via the electric andmanual reversing switch valves, wherein all the electric switch valvesare set up with switch status and parameters according to the operatingmode by the controller. At this time, a cycling pump P1 controlling theheat cycling path and the switch valve K1 are connected, a cycling pumpP2 controlling the cool cycling path and the switch valve K2 aredisconnected, and the energy-storage water tank input gating switchvalves K3-1, K3-2, K3-3 and the energy-storage water tank output gatingswitch valves K3-4, K3-5, K3-6 are switched on, so that the energy forthe variable temperature air-conditioning system is constantly suppliedto the load of the variable temperature air-conditioning load throughthe switched on energy-storage water tank output gating switch valvesK3-4, K3-5, K3-6, so as to assure the operation of the variabletemperature air-conditioning system with energy-storage, and output eventemperature.

When a large energy output is needed, the power of selected water-sourceheat pump can be reduced, due to the reserved energy in theenergy-storage water tanks, so that the investment is lowered. Furthermore, It is avoided that the water-source heat pump is replaced by alarge-volume water tank, the final cycling thermal storage medium waitsto achieve the required temperature, and water tank is too slow to beheated, which results in unstable temperature output so as to needlarger power water-source heat pump, so that the operating efficiency isgreatly increased. The reserved energy-storage water tank can outputenergy when the system is faulty, which improve the system operatingreliability.

In summer cooling operation mode, the condensation end and thevaporization end of the water-source heat pump loop 2 can switch witheach other by switching the switch valve K1 and K2. At this time, acycling pump P2 controlling the cool cycling path and the switch valveK2 are connected, a cycling pump P1 controlling the heat cycling pathand the switch valve K1 are disconnected, and the energy-storage watertank input gating switch valves K3-1, K3-2, K3-3 and the energy-storagewater tank output gating switch valves K3-4, K3-5, K3-6 are switched on,so that the energy for the variable temperature air-conditioning systemis constantly supplied to the load of the variable temperatureair-conditioning load through the switched on energy-storage water tankoutput gating switch valves K3-4, K3-5, K3-6, so as to assure theoperation of the variable temperature air-conditioning system withenergy-storage, and output even cool temperature.

The water-source heat pump can adopts one or more water-source heatpumps, such as electrical water-source heat pump, fuel drivenwater-source heat pump, gas engine driven water-source heat pump orsolid biomass fuel driven water-source heat pump, whose advantages is tochoose low-cost fuel and reserve another as backup so as to avoidemergency, and further increase operation security and reliability ofthe air-conditioning system of agriculture greenhouse.

The energy-storage water tanks B further comprises a heat exchanger. Thesecondary cycling thermal storage medium 311 of the geothermal heatexchanging cycling loop can be water or water solution containing solidphase-change energy storing material, and the final cycling thermalstorage medium 312 of the variable temperature air-conditioning heatexchanging cycling loop can be liquid such as water or alcohols, whereinthe liquid can contain water solution containing solid phase-changeenergy storing material.

During the synchronized constant operating, the operating energy-storagewater tanks store the geothermal heat in the geothermal heat exchangingcycling loop, and output cool or heat energy to the variable temperatureair-conditioning load in the variable temperature air-conditioning heatexchanging cycling loop, so as to meet the requirement of thesimultaneous operating of the geothermal heat exchanging cycling loopand the variable temperature air-conditioning heat exchanging cyclingloop, and of the high standard temperature control and high efficiencyof the constant variable temperature air-conditioning system output, soas to improve the stability of the output temperature of the variabletemperature air-conditioning system for agriculture greenhouse.

During the respective operating at intervals, the energy-storage watertanks can only store the geothermal heat in the geothermal heatexchanging cycling loop, or only output cool or heat energy to thevariable temperature air-conditioning load in the variable temperatureair-conditioning heat exchanging cycling loop. The electricity energy invalley period can be used for energy-storage that can be used in peekperiod. Two or more low power water-source heat pump work alternativelyfor output or energy-storage. Therefore, the backup water-source heatpump can assure the reliability, lower the operating cost andutilization rate, and lower the equipment investment.

The load of the variable temperature air-conditioning load loop, such asheating or cooling cycling pipe 511, 512 can be overhead pipes, whichexchange heat or cool through the pipe wall with the room temperature ofthe farm buildings. Except heating the air, the heating cycling pipes511 can be paralleled, wherein one or more pipes can be buried in thesoil for heating the soil, so as to achieve the heat balance of the airand ground temperature. In summer, when cooling, the manual switch valveof the buried tube can be switched off.

Referring to FIGS. 1, 3, 4 and 5 of the drawings, a variable temperatureair-conditioning method using underground reservoir and water-sourceheat pump with energy-storage and its system applied to residential,commercial or industrial buildings of another embodiment areillustrated, in which the system comprises a underground reservoir 1, awater-source heat pump loop 2, a cycling thermal storage medium 3, ageothermal heat exchanging water supply cycling loop 4, anair-conditioning load loop 5, energy-storage water tanks B, a controller8, a heat absorbing or heat radiating serpentined pipe 9 and electricand manual reversing switch valves. As shown in FIGS. 3, 4, and 5, thegeothermal heat exchanging water supply cycling loop 4 includes theunderground reservoir 1, a water supply pipe 401, a one-way valve 412, awater supply pump 413, a working water tank 6, electric and manualreversing switch valves K1, K2. The variable temperatureair-conditioning load loop includes a heating and cooling cycling pipe501, wherein heating and cooling cycling pipe includes heating cyclingpipe 511 and cooling cycling pipe 512. The cycling thermal storagemedium 3 includes a secondary cycling thermal storage medium 311 and afinal cycling thermal storage medium 312. The underground reservoir 1includes an underground explosive rigid wall 101, a drilling and pipejacking underground reservoir 102, a buried connecting pipe 111, aninfiltration pipe 112, a maintenance hole 113, a thermal insulationlayer 114. The electric and manual switch valves includes a heatingcycling path switch valve K1, a cooling cycling path switch valve K2,energy-storage water tank input gating switch valves K3-1, K3-2,energy-storage water tank output gating switch valves K4-1, K4-2, K5-1,K5-2. Air-conditioning load loop 5 includes a conventionalair-conditioning load loop and a variable temperature air-conditioningload loop.

The geothermal heat exchanging cycling loop A comprises a geothermalheat exchanging water supply cycling loop 4 and a water-source heat pumploop 2. The underground reservoir supplies water from the heat absorbingserpentined pipe or the radiating serpentined pipe 9 to the water-sourceheat pump loop 2 through the geothermal heat exchanging water supplycycling loop 4, and to the energy-storage water tanks 7 through theheating cycling path switch valve K1 and the refrigerating cycling pathswitch valve K2 controlled by the controller 8, and the energy-storagewater tank input gating switch valves K3-1, K3-2, so as to forming ageothermal heat exchanging cycling loop.

Air-conditioning heat exchanging cycling loop C includes a variabletemperature air-conditioning load loop 5, electric and manual reversingswitch valves K1, K2. The energy-storage water tanks output heat or coolenergy to the load of the variable temperature air-conditioning loadloop through the heating cycling path switch valve K1 and the coolingcycling path switch valve K2 controlled by the controller 8, and theenergy-storage water tank output gating switch valves K4-1, K4-2, K5-1,K5-2, so as to forming a air-conditioning heat exchanging cycling loop.The output variable temperature air-conditioning energy includes thevariable temperature air-conditioning energy which has intervals andwhich is constant without intervals.

In order to assure the operation of the variable temperatureair-conditioning system in the residential, commercial or industrialbuildings, indirect variable temperature heating with energy-storage canbe adopted by connecting the evaporation end of the water-source heatpump and the heat absorbing pipe of the underground reservoir, orindirect variable temperature cooling with energy-storage can be adoptedby connecting the condensation end of the water-source heat pump and theheat radiating pipe of the underground reservoir. Besides, directvariable temperature cooling with energy-storage can be adopted byconnecting the working water tank 6 and the cool water transmission pipeof the underground reservoir.

The load of the variable temperature air-conditioning load loop can be afan-coil unit or heat radiator 511, 512, or heat exchanger such as warmwater air-conditioner. Further more, the forgoing heat cycling pipes 511can be paralleled connected, wherein one or more pipes are buried underthe floors in the buildings to radiate heat. In order to keep the eventemperature in each room, the variable temperature heating and coolingcycling pipes further comprises a liquid distributor. The secondarycycling thermal storage medium 311 can be water, and the final cyclingthermal storage medium 312 can be liquid such as water or alcohols,wherein the liquid can contain water solution containing solidphase-change energy storing material.

The underground reservoir may comprises one or more undergroundreservoirs that can be a underground reservoir with undergroundexplosive rigid wall 101 as shown in FIG. 4, which formed by atrenchless explosion, or a trenchless horizontal directional drillingand pipe jacking underground reservoir 102 as shown in FIG. 5, whereinthe pipes are installed by horizontal directional drilling and pipejacking, which is suitable to build a enclosed pipe cavity with adiameter larger than 660 mm. The two of above can be combined. When thepipe of the underground has larger diameter, the underground reservoirmay have a maintenance hole 113 for a maintenance worker entering in andout. The buried pipe of the enclosed pipe cavity may be metal pipe,plastic pipe, glass-fiber pipe, pre-made reinforced concrete pipe, orthe combination of above. As shown in FIG. 5, the underground reservoiris a combination of the above mentioned two types of undergroundreservoirs, which are communicated, wherein the first type serves as amaintenance hole which can reduce the working labor. Besides, two typesof underground reservoirs can be not communicated directly, butcommunicated through heat exchanging pipe 111. When the buried pipes arecombined by the inner and outer pipe casings, a thermal insulation layer114 is provided between the inner and outer pipe casings, such as EPSbubble thermal insulation layer, so as to improve the temperaturepersevering efficiency, and form energy-storage underground reservoir.When adopting steel pipe, the inner and outer surface can be coated withcorrosion protective coating.

Soil heat exchanger comprises a underground reservoir and buried heatexchanging pipes 111 communicated with the underground reservoir. Thespacing between the adjacent buried heat exchanging pipes D ranges from1.5-6 meters, and preferably 3-4 meters, which is determined accordingto the soil composition and underground humidity. Under generalcondition, the spacing had better be 3 meters to achieve higher heatexchanging efficiency.

When the underground energy capacity needs to be expanded, the capacityof the combination type of underground reservoir is easy to be expanded.When adopting transverse trenchless horizontal directional drilling andpipe jacking underground reservoir, more pipes can be configured atspaced-apart multi-layers about 3-8 meters, wherein the pipes atdifferent layers can be parallel or crossing. When the pipes aretransverse, vertical pipes can be added to compensate the energy outputso as to form three-dimension energy-storage and exchanging space.Vertical buried geothermal heat exchanger includes the disclosure inChinese patent ZL200520040450.X.

When the underground rock structure under a building is complex, thecombination type of underground reservoir is needed to increase theenergy capacity and density of the underground reservoir. The preferreddepth of the underground reservoir H is a depth from the 5 m under theground surface to the first water layer, which can get idealconstructing condition, and humanity and heat exchanging efficiency. Inaddition, holes for receiving buried pipe can be filled with moisturepreservation material. When the first water layer is deep, a pluralityof spaced apart infiltration pipes 112 can be provided in the heatexchanging area, so as to keep the humidity to improve the heatexchanging efficiency. The underground reservoir is underground beneaththe agriculture facility, residential, commercial or industrialbuildings including the surrounding area, which does not take up spaces.

One skilled in the art will understand that the embodiment of thepresent invention as shown in the drawings and described above isexemplary only and not intended to be limiting.

It will thus be seen that the objects of the present invention have beenfully and effectively accomplished. It embodiments have been shown anddescribed for the purposes of illustrating the functional and structuralprinciples of the present invention and is subject to change withoutdeparture from such principles. Therefore, this invention includes allmodifications encompassed within the spirit and scope of the followingclaims.

1-10. (canceled)
 11. A variable temperature air-conditioning methodusing underground reservoir and water-source heat pump withenergy-storage, comprising steps of: (a) collecting energy from aunderground reservoir via a water-source heat pump, (b) buffering energyin a plurality of energy-storage water tanks respectively, and (c)exchanging energy between at least one said energy-storage water tankand an air-conditioning load.
 12. The variable temperatureair-conditioning method, as recited in claim 11, wherein eachenergy-storage water tank exchanges energy with an output of thewater-source heat pump and a variable temperature air-conditioning loadrespectively.
 13. The variable temperature air-conditioning method, asrecited in claim 11, wherein energy exchanging between theenergy-storage water tanks and air-conditioning load are constantwithout interval.
 14. The variable temperature air-conditioning method,as recited in claim 12, wherein energy exchanging between theenergy-storage water tanks and air-conditioning load are constantwithout interval.
 15. The variable temperature air-conditioning method,as recited in claim 11, wherein step (b) and step (c) are conductedsimultaneously or respectively.
 16. The variable temperatureair-conditioning method, as recited in claim 14, wherein step (b) andstep (c) are respectively.
 17. The variable temperature air-conditioningmethod, as recited in claim 14, wherein step (b) and step (c) aresimultaneous.
 18. The variable temperature air-conditioning method, asrecited in claim 14, wherein step (b) and step (c) are respectively. 19.An variable temperature air-conditioning system using undergroundreservoir and water-source heat pump with energy-storage, comprising aunderground reservoir, a water-source heat pump communicated with saidunderground reservoir, an air-conditioning load communicated with saidwater-source heat pump, and a plurality of energy-storage water tanksthat are connected in parallel, wherein each energy-storage water tankis communicated with output end of said water-source heat pump via aninput gating switch valve, and communicated with said variabletemperature air-conditioning load via an output gating switch valve. 20.The variable temperature air-conditioning system, as recited in claim19, wherein a heat absorbing unit and a heat radiating unit are providedin said underground reservoir, which are optionally connected with saidwater-source heat pump respectively.
 21. The variable temperatureair-conditioning system, as recited in claim 19, wherein saidunderground reservoir is formed by explosion.
 22. The variabletemperature air-conditioning system, as recited in claim 19, whereinsaid underground reservoir comprises buried pipes that are formed bytrenchless horizantal directional drilling and pipe jacking.
 23. Thevariable temperature air-conditioning system, as recited in claim 20,wherein said underground reservoir is formed by explosion.
 24. Thevariable temperature air-conditioning system, as recited in claim 20,wherein said underground reservoir comprises buried pipes that areformed by trenchless horizantal directional drilling and pipe jacking.25. The variable temperature air-conditioning system, as recited inclaim 22, wherein said buried pipes is embodied as at least one selectedfrom a group consisting of metal pipe, plastic pipe, glass-fiber pipe,or pre-made reinforced concrete pipe.
 26. The variable temperatureair-conditioning system, as recited in claim 24, wherein said buriedpipes is embodied as at least one selected from a group consisting ofmetal pipe, plastic pipe, glass-fiber pipe, or pre-made reinforcedconcrete pipe.
 27. The variable temperature air-conditioning system, asrecited in claim 22, wherein said buried pipes comprise an inner casingand an outer casing, wherein a thermal insulation material is providedtherebetween.
 28. The variable temperature air-conditioning system, asrecited in claim 24, wherein said buried pipes comprise an inner casingand an outer casing, wherein a thermal insulation material is providedtherebetween.
 29. The variable temperature air-conditioning system, asrecited in claim 22, wherein said underground reservoir comprisesmulti-layers in a longitudinal direction, wherein every two adjacentpipe casings have a spacing ranging from 3 meters/9.8425 feet to 8meters/26.25 feet.
 30. The variable temperature air-conditioning system,as recited in claim 24, wherein said underground reservoir comprisesmulti-layers in a longitudinal direction, wherein every two adjacentpipe casings have a spacing ranging from 3 meters/9.8425 feet to 8meters/26.25 feet.